Halo Structure of the Neutron-Dripline Nucleus B19
Halo Structure of the Neutron-Dripline Nucleus B19
复制标题
中子滴线核 B19 的晕结构
DOI：
10.1103/physrevlett.124.212503
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发表时间：
2020
影响因子：
8.6
通讯作者：
Kondo Y. et al.
中科院分区：
文献类型：
--
作者：
Cook K.J.;Nakamura T.;Kondo Y. et al.
本文用库仑离解的方法研究了硼的最重束缚同位素在原子核中与铅碰撞时的库仑离解。在相对能量低于6 MeV时，在两中子衰变阈值以上观察到增强的电偶极强度，其积分强度为B（E1）=1.64±0.06（stat）±0.12（sys）e2 fm ~ 2。这个被称为软激发的特征，提供了第一个有力的证据，证明存在一个显著的双中子晕。再现能谱的三体计算表明，价中子有一个显着的波配置，并表现出双中子相关。
The heaviest bound isotope of boronhas been investigated using exclusive measurements of its Coulomb dissociation, intoand two neutrons, in collisions with Pb at. Enhanced electric dipole () strength is observed just above the two-neutron decay threshold with an integratedstrength of B(E1)=1.64±0.06(stat)±0.12(sys) e2 fm2 for relative energies below 6 MeV. This feature, known as a softexcitation, provides the first firm evidence thathas a prominent two-neutron halo. Three-body calculations that reproduce the energy spectrum indicate that the valence neutrons have a significant-wave configuration and exhibit a dineutronlike correlation.